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Commitments and Contingencies (Tables)
 6 Months Ended
Jul. 01, 2016
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Lease Payments Under Non-cancelable Operating Leases
Future minimum lease payments under non-cancelable operating leases as of July 1, 2016 are as follows (in thousands):
Years ending December 31,
 
2016 (remaining six months)
$
5,246

2017
12,451

2018
11,768

2019
10,248

2020
7,574

Thereafter
10,428

Total
$
57,715
Summary of Warranty Accrual Included in Accrued Liabilities
Activity for the Company’s warranty accrual, which is included in accrued liabilities, is summarized below (in thousands):
 
Three months ended
 
Six months ended
 
July 1,
2016
 
July 3,
2015
 
July 1,
2016
 
July 3,
2015
Balance at beginning of period
$
4,966

 
$
4,091

 
$
3,913

 
$
4,242

   Balance assumed from TVN acquisition
—

 
—

 
1,012

 
—

   Accrual for current period warranties
1,716

 
1,530

 
2,975

 
3,125

   Changes in liability related to pre-existing warranties
(74
)
 
(92
)
 
(74
)
 
(92
)
   Warranty costs incurred
(1,513
)
 
(1,362
)
 
(2,731
)
 
(3,108
)
Balance at end of period
$
5,095

 
$
4,167

 
$
5,095

 
$
4,167